Kiln and heating method thereof

ABSTRACT

A kiln includes a stove, a combustion device, and an exhaust pipe, wherein the stove includes a cavity, an entry, and an air outlet. The cavity includes a front section and a rear section, and a top wall surface of the front section is tilt. The air outlet is disposed between a top of the front section of the cavity and the entry. The combustion device is disposed in the rear section. The combustion device includes at least one burner, a supporting assembly, and an infrared ray generation assembly. The supporting assembly includes a cover plate having a hollow portion. The infrared ray generation assembly is mounted to the supporting assembly and located above the cover plate. The infrared ray generation assembly could be heated by the flames of the burner to generate infrared ray which passes through the hollow portion. The exhaust pipe communicates with the air outlet.

BACKGROUND OF THE INVENTION 1. Technical Field

The present invention is related to a heating apparatus, and moreparticularly to a kiln which burns gas to generate heat and a heatingmethod thereof.

2. Description of Related Art

Conventional kilns are adapted for cooking food, such as baking pizza,roasting chicken, stewing vegetables, etc. The stove of conventionalkilns is usually built by stacking stone material, and an entry isformed at the front side of the stove to communicate with an inside ofthe cavity. During the stove is in use, wood is added into the cavityfrom the entry and then the wood is burned to heat the cavity. When thecavity is heated to a temperature suitable for baking food, foodingredients are placed into the cavity from the entry so as to cook thefood.

Since the wood and the food ingredients are placed into the same space,the ashes generated from burning the wood are easily fallen onto thefood ingredients to pollute the food ingredients. Furthermore, when thewood is used as a heat source, the temperature of the cavity is not easyto control and the heating efficiency thereof is low.

Also, when the conventional kilns, which burns wood, generate open fireto heat the food ingredient, the high-temperature open fire is appliedto the surface of the food ingredient first, and then the heat isgradually conducted into the inside of the food ingredient. Therefore,it is usually seen that the surface of the food ingredient has beenburnt but the inside of the food ingredient is not yet cooked.

Furthermore, since the exterior of the stove is exposed to the outside,the internal heat of the cavity, which has a temperature being greaterthan 300° C., would be transferred to the outside from the stove whenthe kiln is operated in a baking process. If a user accidentally touchesa front side of the stove in the operation process, it is possible thatthe user would get burned.

Therefore, there is still a need to provide an improvement of the designof the conventional kilns so as to overcome the aforementioneddrawbacks.

BRIEF SUMMARY OF THE INVENTION

In view of the above, an object of the present invention is to provide akiln having a good heating efficiency and a heating method thereof.

Another object of the present invention is to provide a kiln and aheating method thereof, which could prevent the user from being burned.

The present invention provides a kiln including a stove, a combustiondevice, and an exhaust pipe. Wherein, the stove includes a cavity, anentry, and an air outlet; the cavity includes a front section and a rearsection; the front section communicates with the entry, while the rearsection is away from the entry; a top wall surface of the front sectiontilts downwardly toward the entry; the air outlet is located between atop of the front section and the entry; the combustion device isdisposed in the rear section of the cavity and including at least oneburner, a supporting assembly, and an infrared ray generation assembly;the at least one burner includes a flame outlet; flames are generatedfrom the flame outlet by burning gas via the at least one burner; thesupporting assembly includes a cover plate which is disposed above theat least one burner and includes at least one hollow portion; theinfrared ray generation assembly is mounted to the supporting assemblyand is located above the cover plate; the infrared ray generationassembly is heated by the flames generated by the at least one burner togenerate infrared ray; the infrared ray generation assembly includes anemission surface which is corresponding to the at least one hollowportion and adapted to emit the infrared ray; the exhaust pipecommunicates with the air outlet.

In one embodiment, the kiln includes a housing disposed on an exteriorof the stove. An isolation space is formed between the housing and theexterior of the stove.

The present invention also provides a heating method for the kiln. Theheating method includes steps of:

controlling the at least one burner to generate flames and heating theinfrared ray generation assembly with the heat to generate infrared ray,wherein the flames generated by the at least one burner pass through thecover plate and form an open fire on the top of the cavity;

forming over-heated steam from the steam generated by burning gas andpassing the over-heated steam through coke which is formed on theinfrared ray generation assembly while burning the gas; and

guiding hot air flow from the top wall surface of the front section ofthe cavity downwardly to make to hot air flow back to the at least oneburner, and drawing air from the entry at the same time.

The advantage of the present invention is that a dual heating effectcould be achieved by utilizing the open fire and the infrared raygenerated by the combustion device, and the heating efficiency could beimproved by forming the over-heated steam and the structural design ofthe stove as well, whereby a cooking time for the good ingredients couldbe shortened. In addition, the isolation space could provide a thermalinsulation effect, which could prevent heat conducting from the stove tothe housing so as to avoid the user from being burned when the useraccidentally touches the housing.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The present invention will be best understood by referring to thefollowing detailed description of some illustrative embodiments inconjunction with the accompanying drawings, in which

FIG. 1 is a perspective view of a kiln of a first embodiment accordingto the present invention;

FIG. 2 is an exploded view of the kiln of the first embodiment;

FIG. 3 is a perspective view of the door of the first embodiment;

FIG. 4 is a perspective view of the cavity of the first embodiment;

FIG. 5 is a cross-sectional view of the kiln of the first embodiment;

FIG. 6 is a schematic view of the thermal insulation structure of thefirst embodiment;

FIG. 7 is a partial cross-sectional view of the kiln of first theembodiment;

FIG. 8 is a perspective view of the combustion device of the firstembodiment;

FIG. 9 is an exploded view of the combustion device of the firstembodiment;

FIG. 10 is a schematic view showing that inside of the cavity of thekiln as illustrated in FIG. 1 is being heated;

FIG. 11 is a perspective view of a combustion device of a secondembodiment according to the present invention;

FIG. 12 is a partial perspective view of the combustion device of thesecond embodiment;

FIG. 13 is a perspective view of a kiln of a third embodiment accordingto the present invention, wherein a thermal insulation structure and aheat conductive structure are omitted;

FIG. 14 is a cross-sectional view of the kiln of the third embodiment;

FIG. 15 is a schematic view of a kiln of a fourth embodiment; and

FIG. 16 is a schematic view of a kiln of a fifth embodiment according tothe present invention.

DETAILED DESCRIPTION OF THE INVENTION

The following illustrative embodiments and drawings are provided toillustrate the inventive subject matter, its advantages and effects sothat it can be clearly understood by persons skilled in the art afterreading the disclosure of this specification.

As illustrated in FIG. 1 to FIG. 10, a kiln 100 of a first embodimentaccording to the present invention includes a stove 10, a housing 36, adoor 38, and a heat source which is a combustion device 40 as anexample.

The stove 10 includes a cavity 12 and an entry 14. Wherein, the cavity12 includes a front section 122 and a rear section 124. The frontsection 122 communicates with the entry 14, and a top wall surface atthe front section 122 tilts toward the entry 14 downwardly. The rearsection 124 is away from the entry 14. An inner wall surface 124 a islocated at the rear section 124 and faces the entry 14. A top wallsurface at the rear section 124 tilts upwardly in a direction away fromthe inner wall surface 124 a. The cavity 12 further includes a middlesection 126 which is located between the front section 122 and the rearsection 124. A top wall surface at the middle section 126 is higher thanthose of the front section 122 and the rear section 124, wherein amaximum distance L between the top wall surface and a bottom of themiddle section 126 along a direction from the front section 122 to therear section 124 remains the same (as shown in FIG. 5). That is, themaximum distance L between the between the top wall surface and thebottom of the middle section 126 remains as a constant in the middlesection. The top wall surface at the rear section 124 tilts downwardlyfrom the middle section toward a direction away from the entry 14.

In the current embodiment, the stove 10 includes a chamber 16, an airguide structure 18, a heat storage member 22, a thermal insulationmember 24, and a base 28. Wherein, the chamber 16 is a substantiallyarch shape and made of metal such as stainless steel. A front end of thechamber 16 is open, and the entry 14 is formed at the front end of thechamber 16. A rear end of the chamber 16 is closed, and includes theinner wall surface 124 a. The cavity 12 is within the chamber 16. Thechamber 16 is disposed on the base 28, wherein the chamber 16 includes amain body 162, a first inclined plate 164 and a second inclined plate166. A middle part 162 a is formed on a top of the main body 162,wherein the first inclined plate 164 and the second inclined plate 166are joined to a front end and a rear end of the middle part 162 arespectively. The first inclined plate 164 is corresponding to the frontsection 122 of the cavity 12, the middle part 162 a is corresponding tothe middle section 126 of the cavity 12, and the second inclined plate166 is corresponding to the rear section 124 of the cavity 12. An innersurface of the first inclined surface 164 constitutes the top wallsurface of the front section 122, while an inner surface of the secondinclined plate 166 constitutes the top wall surface of the rear section124.

An air outlet 164 a is formed on the first inclined plate 164 of thechamber 16, wherein the air outlet 164 a communicates with the entry 14and is disposed between the top of the front section 122 of the cavityand the entry 14. The air guide structure 18 is disposed in the chamberand located at the top of the front section 122 of the cavity 12,wherein the air guide structure 18 communicates with the air outlet 164a. In the current embodiment, the air guide structure 18 includes aguide plate 182 and a lid plate 184. The guide plate 182 is joined tothe first inclined plate 164, wherein an angle between the guide plate182 and the first inclined plate 164 is smaller than 90 degrees. The lidplate 184 is an arch shape, wherein two sides of the lid plate 184 arejoined to the chamber 16, and an inner surface of the lid plate 184 isjoined to a peripheral edge of the guide plate 182. A space S1 isenclosed by the lid plate 184, the guide plate 182, and the firstinclined plate 164. The space S1 is adapted to receive the heat storagemember 22. An exhaust pipe 20 is joined to the lid plate 184 anddisposed above the air guide structure 18. The guide plate 182 tiltsupwardly from the air outlet 164 a toward a direction away from theentry 14. Whereby, an exhaust channel E is formed by the guide plate 182of the air guide structure 19 and the exhaust pipe 20. The heat storagemember 22 covers the first inclined plate 164, i.e., the heat storagemember 22 is disposed at an exterior of the chamber 16 at the top of thefront section 122 of the cavity 12, and at least part of the heatstorage member 22 is located in the space S1 and contacts the air guidestructure 18. In the current embodiment, part of the heat storage member22 is located in the space S1, while another part of the heat storagemember 22 protrudes out of the space S1, and the air guide structure 19contacts an exterior surface of the guide plate 182. Preferably, athermal conductivity of the heat storage member 22 is equal to orgreater than 0.7 W/(mK), and a heat storage density thereof is equal toor greater than 1 KJ/m³K. In the current embodiment, the thermalconductivity of the heat storage member 22 is 0.8-0.93 W/(mK), and theheat storage density thereof is 1.4 KJ/m³K. The heat storage member 22includes a plurality of stacked particles (e.g. sands, or pebbles), andthe air fills the gaps between the stacked particles. By enclosingwithin the space S1, the particles could be prevented from sliding down.

In addition, the thermal insulation structure 24 covers the exterior ofthe chamber 16 which is corresponding to the rear section 124 and themiddle section 126, and is disposed at an outer peripheral of the heatstorage member 22. A heat insulation effect of the thermal insulationstructure 24 is better than that of the heat storage member 22, wherebya temperature at the middle section 126 of the cavity 12 is higher thanthat of the front section 122 so as to increase heat convection. Inpractice, the heat storage member 22 also could be omitted, and part ofthe thermal insulation structure 24 could extend to a position where theheat storage member 22 locates. As illustrated in FIG. 6, the thermalinsulation structure 24 includes, from outward to inward, a firstreflection layer 241, a barrier layer 242, a thermal insulation layer243, a second reflection layer 244, a heat storage layer 245, and a heatconduction layer 246.

The thermal conductivity of the heat conduction layer 246 is greaterthan that of the heat storage layer 245. The heat conduction layer 246is adapted to absorb part of heat from the chamber 16 rapidly andtransfer the heat to the heat storage layer 245, whereby the heat couldbe stored into the heat storage layer 245. Wherein, the thermalconductivity of the heat conduction layer 246 is equal to or greaterthan four times of that of the heat storage layer 245. Preferably, thethermal conductivity of the heat conduction layer 246 is equal to orgreater than 35 W/(mK), and more preferably, greater than 40 W/(mK). Inthe current embodiment, the thermal conductivity of the heat conductionlayer 246 is between 40.096 and 46.285 W/(mK). Meanwhile, the thermalconductivity of the heat storage layer 245 is preferably equal to orsmaller than 8.5 W/(mK), and more preferably smaller than 8.3 W/(mK). Inthe current embodiment, the thermal conductivity of the heat storagelayer 245 is between 1.689 and 8.203 W/(mK).

The second reflection layer 244 includes a second heat reflectionsurface 244 a which is made of metal, and faces the heat storage layer245 and the chamber 16. The second heat reflection surface 244 a couldreflect radiation heat back to the chamber 16, and thereby to stop 70%of the heat from dissipating out and could block heat convection aswell. When heat storage layer 245 is thermally saturated, the heatdissipates from the heat storage layer 245 would transfer back to thechamber 16 through the heat conduction layer 246, and thereby to provideheat insulation effect for the chamber 16. The thermal conductivity ofthe second reflection layer 244 is preferably between 0.62 and 0.72W/(mK). In the current embodiment, the thermal conductivity of thesecond reflection layer 244 is 0.67 W/(mK).

In addition, the heat conducted from the second reflection layer 244would be retained in the thermal insulation layer 243. The thermalconductivity of the thermal insulation layer 243 is equal to or smallerthan that of the heat storage layer 245. Preferably, the thermalconductivity of the thermal insulation layer 243 is lower than that ofthe heat storage layer 245. The barrier layer 242 is adapted to insulatethe heat convecting from the thermal insulation layer 243 so as tobarrier the convection heat and reduce the heat dissipation from thermalinsulation layer 243. The thermal conductivity of the barrier layer 242is greater than that of the thermal insulation layer 243 and smallerthan that of the heat storage layer 245. The first reflection layer 241includes a first heat reflection surface 241 a which is made of metal,and faces the thermal insulation layer 243 and the chamber 16. The firstheat reflection surface 244 a could reflect the heat radiated from thethermal insulation layer 243 back to the chamber 16. Preferably, theheat conductivity of the thermal insulation layer 243 is equal to orsmaller than 0.2 W/(mK). In the current embodiment, the heatconductivity of the thermal insulation layer 243 is between 0.04 and0.16 W/(mK). Preferably, the thermal conductivity of the barrier layeris between 0.4 and 0.6 W/(mK). In the current embodiment, the thermalconductivity of the barrier layer 243 is between 0.483 and 0.551 W/(mK).

A cladding layer 26 could be further disposed on the thermal insulationstructure 24, wherein the cladding layer covers the thermal insulationstructure 24 and the heat storage member 22, whereby to fix the thermalinsulation structure 24 and the heat storage member 22. However, thecladding layer 26 also could be omitted.

In the current embodiment, the first reflection layer 241 and the secondreflection layer 244 could be made of aluminum foil, which not onlycould reflect the radiation heat but also could effectively block theheat source, and further could provide water resistance and moistureresistance. The barrier layer 242 could include refractory material,such as lime. The thermal insulation layer 243 includes organic fibermaterial (e.g. ceramic fiber, glass fiber, rock wool, etc.) which isfilled with air, thereby forming the thermal insulation layer 243 with athermal conductivity similar to air so as to insulate heat. The heatstorage layer 245 could be formed by mixing materials of clay, stonematerial particles or powder, refractory material, cement, etc. The heatconduction layer 246 could be formed by mixing materials of siliconcarbide, magnesium oxide, refractory material, cement, etc.

In practice, except the thermal insulation structure having amulti-layer arrangement as described above, the thermal insulationstructure 24 also could have, but is not limited to, other types ofarrangement methods which would be illustrated below:

Type (1): at least including the heat conduction layer 246, the heatstorage layer 245, and the second reflection layer 244, wherein the heatconduction layer 246 contacts the chamber 16, and the heat storage layer245 is disposed between the second reflection layer 244 and the heatconduction layer 246;

Type (2): including the arrangement as mentioned in type (1), andfurther including the first reflection layer 241 and the thermalinsulation layer 243 on the second reflection layer 244; alternatively,further including the barrier layer 242 in addition to the firstreflection layer 241 and the thermal insulation layer 243, wherein thebarrier layer 242 is disposed between the thermal insulation layer 243and the first reflection layer 241;

Type (3): at least including the first reflection layer 241 and thethermal insulation layer 243, wherein the thermal insulation layer 243is disposed between the first reflection layer 241 and the chamber 16;

Type (4): in addition to the first reflection layer 241 and the thermalinsulation layer 243, further including the barrier layer 242, whereinthe barrier layer 242 is disposed between the thermal insulation layer243 and the first reflection layer 241;

Type (5): in addition to the first reflection layer 241 and the thermalinsulation layer 243, further including the heat storage layer 245,wherein the heat storage layer 245 is disposed between the thermalinsulation layer 243 and the chamber 16;

Type (6): including the arrangement as mentioned in type (5), andfurther including the second reflection layer 244, wherein the secondreflection layer 244 is disposed between the thermal insulation layer243 and the heat storage layer 245; alternatively, further including theheat conduction layer 246 in addition to the second reflection layer244, wherein the heat conduction layer 246 is disposed between the heatstorage layer 245 and the chamber 16, and contacts the chamber 16; and

Type (7): including the arrangement as mentioned in type (5), furtherincluding the heat conduction layer 246, wherein the heat conductionlayer 246 contacts the chamber 16, and the heat storage layer 245 isdisposed between the heat conduction layer 246 and the thermalinsulation layer 243.

In the current embodiment, the thermal insulation structure 24 isutilized in a heater which is the kiln 100 as an example, but it is notlimited thereto. The heat insulation structure also could be applied tochambers of other types of heaters, such as an oven, a baking apparatus,a heating apparatus, a thermal insulation apparatus, etc. Wherein, aheat insulation effect could be further achieved if the housing 36 isdisposed on the exterior of the insulation structure 24, and an air gapis formed therebetween as described in the current embodiment.

The stove 10 is disposed on a stage 30. In more details, the stove 10 ismounted on the stage 30 via the base 28, which at least includes acarrier plate 282 and a thermal insulation plate 284. In the currentembodiment, the base 28 includes two carrier plates 282 which face thecavity 12 and are adapted for placing food ingredients. The thermalinsulation plate 284 is disposed under the carrier plate 282 and acrossa plurality of frames of the stage 30. In practice, the carrier plate282 could be rock board as an example, and the thermal insulation platescould be rock wool as an example. An air isolation is disposed betweenthe stage 30 and the base 28 for heat insulation. A gas regulation valveis disposed in the stage 30 (not shown), wherein the gas regulationvalve includes a knob 32 disposed at a front side of the stage 30 for auser to adjust a flow rate of gas manually. An ignition switch 34 isfurther disposed at the front side of the stage 30.

The housing 36 is joined to the stage 30 and surrounds the stove 10,wherein an isolation space S2 is formed between the housing 36 and thestove 10. The housing 36 is made of metal such as stainless steel andincludes a front plate 362, a rear plate 364, and a cover 366. Wherein,the front plate 362 is joined to the stage 30 and disposed at a frontside of the entry 14 of the stove 10; the front plate 362 includes afeeding opening 362 a which communicates with the entry 14 and theexhaust channel E formed by the guide plate 182 and the exhaust pipe 20.The front plate 362 and the stove 10 are spaced apart with a distanceD1. The rear plate 364 is joined to the stage 30 and is disposed at arear side of the stove 10. The rear plate 364 and the stove 10 arespaced apart with a distance D2. The cover 366 includes a front edge 366a and a rear edge 366 b which are respectively joined to the front plate362 and the rear plate 364. A through hole 366 c is formed on the cover366 above the front section 122 of the cavity 12, wherein the throughhole 366 c is adapted for penetration of the exhaust pipe 20. The cover366 and the stove 10 are spaced apart with a distance D3. The isolationspace S2 consists of the distance D1, D2 and D3 which are respectivelyformed between the stove 10 and the front plate 362, the rear plate 364,and the cover 366, and the isolation space S2 is adapted to insulateheat and avoid heat dissipating from the stove 10 to the housing 36directly. When designing a compact kiln, the metallic chamber couldprovide a sufficient support to sustain the thermal insulationstructure, which could effectively improve the drawback of beingdifficult to be scaled down in size corresponding to conventional kilnswhich are formed by stacking thick stone material. In addition, aflameproof layer 368 could be further disposed on an interior surface ofthe cover 366 of the cover 366. The flameproof layer 368 is formed by aflameproof coating and adapted to reduce an amount of residual heatdissipated from the stove 10 to the exterior of the cover 366 so as toavoid an over-high temperature on the exterior surface of the cover 366.In the compact size design, the flameproof layer 368 also could preventthe user from being burned by touching the cover 366. Furthermore, theflameproof layer 368 also could be disposed on interior surfaces of thefront plate 362 and the rear plate 364, which could reduce the amount ofresidual heat dissipated from the stove to the housing 36 as well.

The door 38 is adapted to cover at least one portion of the entry 14.The door 38 includes a main plate 382, at least one shield 384, and ablocking plate 386, wherein the main plate 382 is detachably joined tothe stove 10 at the entrance 14; the main plate 382 includes a pluralityof first vents 382 a and a plurality of second vents 382 b; theplurality of first vents 382 a are laterally arranged at the bottom ofthe main plate 382; the plurality of second vents 382 a are divided intotwo groups, and each of the two groups is disposed above the pluralityof first vents 382 a; the second vents 382 b of each group are arrangedin a circular shape. In the current embodiment, the door 38 includes twoshields 384, each of which is movably disposed on an exterior surface ofthe main plate 382 corresponding to each group of the second vents 382b. Each of the shields 384 includes a plurality of adjusting holes 384a. By turning the shields 384 to close the plurality of second vents 382b or partially shield the plurality of second vents 382 b, an air flowpassing through the plurality of second vents 382 b could be adjustedvia the adjusting holes 384 a. The blocking plate 386 is joined to aninner edge of the main plate 382, wherein the blocking plate 386 wouldclose the air outlet 164 a when the door 38 is at the entry 14. Theexhaust channel E formed by the air guide structure 18 and the exhaustpipe 20 would be isolated from the interior of the cavity 12.

The combustion device 40 is disposed within the cavity 12 at the rearsection 124 and includes at least one burner 42, a supporting assembly46, and an infrared ray generation assembly 54. In the currentembodiment, the combustion device 40 includes a plurality of burners 42,wherein the plurality of burners 42 jointly communicate with a flowdivider 44 via a plurality of terminals thereof, and then communicatewith a gas regulation valve disposed in the stage 30 through the flowdivider 44. A flame outlet 422 is disposed at another terminal of eachof the burners 42, and the burners 42 are adapted to burn gas togenerate flames through the flame outlets 422. An ignition assembly 56is disposed beside the burners 42, wherein the ignition assembly 56 isconnected to the ignition switch 34 and adapted for igniting gassupplied from the flame outlet 422; the ignition assembly 56 includes anignitor and a pilot pipeline. An axis i which passes through acorresponding center of each flame outlet 422 is extended along alongitudinal direction of each of the burners 42.

The supporting assembly 46 includes a cover plate 48 which issubstantially a bowl shape and disposed above the burners 42. In avertical direction, the cover plate 48 is located at a position with aheight greater than a half of the distance L between the top and thebottom of the middle section of the cavity 12 (as shown in FIG. 5). Thecover plate 48 includes at least one hollow area. In the currentembodiment, there are a plurality of hollow areas, including an opening482 and a plurality of holes 484, wherein the opening 482 iscorresponding to the flame outlet 422 of each of the burners 42. Theinfrared ray generation assembly 54 is disposed in the supportingassembly 46, and the cover plate 48 is disposed between the infrared raygeneration assembly 45 and the burners 42. In the current embodiment,the infrared ray generation assembly 54 is located above the cover plate48, such that the flames generated by the burners would pass through theopening 482 to apply on the infrared ray generation assembly 54, whichmakes the infrared ray generation assembly 54 generate infrared ray. Theinfrared ray generation assembly 54 includes an emission surface 542 ato emit infrared ray which faces the cover plate 48 and is correspondingto the opening 482 and the holes 484, thereby enabling the generatedinfrared ray to pass through the opening 482 and the holes 484. Inpractice, the emission surface 542 a is at least corresponding to theholes 484. An angle is formed between the emission surface 542 a and theaxis i, wherein the angle is between 100 and 135 degrees. In addition,another function of the cover plate 48 is to maintain a temperature ofthe infrared ray generation assembly 54 so as to reduce heat dissipationof the infrared ray generation assembly 54.

In the current embodiment, the supporting assembly 46 further includes asupporting plate 50 and another cover plate 52. The supporting plate 50includes a first part 502 and a second part 504; the second part 504 islocated above the first part 502, and an obtuse angle is formed betweenthe first part 502 and the second part 504; the first part 502 and theinner wall surface 124 a of the rear section 124 are spaced apart with agap a1, while the second part 504 and the top wall surface of the rearsection 124 are spaced apart with a gap a2. The burners 42 are mountedto the first part 502, and said another cover plate 52 is mounted tosecond part 504 and joined to the cover plate 48, whereby the two coverplates 48, 52 jointly form a containing space S3. The infrared raygeneration assembly 54 is disposed in the containing space S3. Saidanother cover plate 52 also includes a plurality of holes 522, and alsocould maintain the temperature of the infrared ray generation assembly54 so as to reduce heat dissipation of the infrared ray generationassembly 54.

The infrared ray generation assembly 54 includes an infrared raygeneration mesh 542 and a reflection plate 544. The infrared raygeneration mesh 542 includes two surfaces which are opposite to eachother, wherein one of the two surfaces is the emission surface 542 a,while the other surface is the emission surface 542 b which faces areflection surface 544 a of the reflection plate 544. The reflectionsurface 544 a is an arc surface which is concaved toward a directionaway from the infrared ray generation mesh 542, whereby the infrared rayemitted by the other emission surface 542 b could be centralized andreflected downwardly. The cover plate 48 includes an exterior surfacehaving an arc shape and is protruded outwardly toward a direction awayfrom the infrared ray mesh 542 of the infrared ray generation assembly54. The cover plate 48 also could generate infrared ray by heating,while the arc-shape exterior surface thereof could increase a rangecovered by the infrared ray. In the current embodiment, the infrared raymesh 542 includes a plurality of grids, each of which includes a sizesmaller than that of each of the holes 484, 522 of the cover plates 48,52. The flame outlets 422 of the burners 42 are corresponding todifferent portions of the infrared ray generation mesh 542 respectively.

The infrared ray generation mesh 542 could be an alloy mesh, such asheat-resistant steel (e.g. FCHW2) mesh, iron-chromium-aluminum alloymesh, iron-nickel-aluminum alloy mesh, etc. The two cover plates 48, 52could be made of different stainless steel material. The reflectionplate 544 could be made of metal alloys which reflect infrared ray. Inpractice, the reflection plate 544 also could be omitted.

The infrared ray generation assembly 54 and the cover plate 48constitute a heating device of the heat source and are adapted togenerate heat for heating the cavity 12, which could heat the foodingredients from top down so as to make surfaces of the food ingredientsto be heated uniformly.

With the aforementioned structure, a heating method for the kiln 100according to the present invention includes the following steps.

First, the user adjusts the knob 32 of the gas regulation valve and theignition switch 34 to control the burners 42 to generate flames. Asillustrated in FIG. 7 to FIG. 10, after generating the flames, theinfrared ray generation assembly 54 is heated by the flames to generateinfrared ray. In the current embodiment, the flames apply to theinfrared ray generation mesh 542, which makes the two emission surfaces542 a, 542 b to emit infrared ray. The infrared ray emitted by theemission surface 542 a, which is close to the cover plate 48, irradiateson the carrier plate 282 through the holes 484 of the cover plate 48,thereby providing a larger heating area. Meanwhile, the infrared rayemitted by the emission surface 542 b which is close to the reflectionplate 544 is reflected to the infrared ray generation mesh 542 by thereflection surface 544 a of the reflection plate 544, and irradiates onthe carrier plate 282 through the grids of the infrared ray generationmesh 542, and the holes 484 of the cover plate 48 so as to increase anintensity of the infrared ray irradiated on the carrier plate 282. Sincethe angle formed between the axis i of the burners and the emissionsurfaces 542 a, 542 b of the infrared ray generation mesh 542 is between100 and 135 degrees, the flames could be uniformly acted on the emissionsurfaces 542 a, 542 b of the infrared ray generation mesh 542, whichachieves an optimal performance for the infrared ray emission. Theflames generated by the burners 42 also apply on the cover plate 48 tomake the cover plate 48 to generate infrared ray, and thereby toincrease the intensity of the infrared ray irradiated on the carrierplate 282.

The temperature of the infrared ray generation assembly 54 is maintainedto be between 900 and 100° C., and the infrared ray generation assembly54 is blocked by the cover plate 48, which enables the infrared rayhaving an optimum range of infrared ray wavelength to pass through theholes 484 of the cover plate 48. Preferably, a wavelength range isbetween 4 to 8 μm, which could provide a better transmission efficiencyfor the heated food ingredients on the carrier plate 282 so as to heatan interior of the food ingredients. A temperature on the exteriorsurface of the cover plate 48, i.e., the surface which faces toward adirection away from the infrared ray generation assembly 54, is between600 and 800° C.

The flames generated by the burners 42 penetrates upwardly through theholes 484, 522 of the two cover plates 48, 52 to form an open fire atthe top of the middle section 126. The open fire is adapted to heat thesurface of the food ingredients, such as scorching the surface of thefood ingredients to form golden color. The combustion device 40 couldhave a larger heating area so as to achieve a uniform heating andincrease a heating efficiency.

Since coke is formed on the infrared ray generation assembly 54 when gasburns, and an over-heated steam is generated from the steam formed byburning the gas, a reaction to generate water-gas which includeshydrogen and carbon monoxide would occur when the over-heated steampasses through the hot coke having a temperature between 900 and 1100°C. on the infrared ray generation assembly 54, which provides anauxiliary fuel to the gas burning.

For example, water-gas is generated when the steam passes thehigh-temperature coke according to equation 1:

C+H₂O→H₂+CO−113.4 KJ   (1)

The generation heat equals to −113.4 KJ, which represents that equation1 is an endothermic reaction. However, the generated hydrogen and carbonmonoxide would react with the steam formed in the combustion accordingto equation 2, which is an exothermic reaction.

CO+H₂O→H₂+CO₂+42.71 KJ; H2+½O₂→H₂O+237.4 KJ   (2)

A total generation heat of equation 2 equals to 280.11 KJ. An overallreaction heat of equation 1 and equation 2, which subtracts 113.4 KJfrom 280.11 KJ, would be 166.71 KJ. It could be understood that thegeneration of the water-gas when the over-heated steam passes throughthe coke on the infrared ray generation assembly 54 could increase aheating efficiency, whereby a consumption of gas could be reduced. Theadvantage of placing the infrared ray generation assembly 54 between thetwo cover plates 48, 52 is that the temperature of the infrared raygeneration assembly 54 could be kept between 900 and 1000° C. which isnecessary for generating the water-gas under a limited amount of gasconsumption by utilizing the cover plates 48, 52 to maintain thetemperature of the infrared ray generation assembly 54. Meanwhile, thecover plates 48, 52 are concaved toward a direction away from theinfrared ray generation assembly 54, which enables part of the heat tobe concentrated and reflected back to the infrared ray generationassembly 54, thereby providing a better performance in maintaining thetemperature. In contrast, simply utilizing the cover plate 48 also couldmaintain the temperature of the infrared ray generation assembly 54between 900 and 1000° C., but the gas consumption thereof would behigher than that of the examples of utilizing the two cover plates 48,52.

A temperature of the overheated steam is about 300° C. and higher,wherein water molecules would become smaller water vapor which couldpenetrate food and dissolve fat at high temperature to increase aheating efficiency of cooking food ingredients, whereby the over-heatedsteam also could be adapted to heat food ingredients. Moreover, thewater vapor generated from the food ingredients also would be heated toform over-heated vapor so as to further increase the heating efficiency.

The burners 40 creates a high-temperature zone at a higher position tomake the hot air flow formed by combustion, i.e., the hot air flowformed by the heat generated from the heating assembly of the heatsource, be guided downwardly by the wall surface of the top of the frontsection 122 of the cavity 12, which facilitates the hot air flowing backto the burners 42 and reduces heat dissipation. Meanwhile, external airwould be drawn in from the entry 14 as combustion-supporting airtogether with the flowing-back of the hot air flow. By mixing theexternal air with the hot air flow which flows back, a temperature ofthe air flowing back to the burners 42 could be increased to avoid coldair directly flowing back to the burners 42, whereby heat dissipationcould be reduced so as to increase heat efficiency. Moreover, thethermal insulation structure 24 covers the chamber 16, which couldmaintain the temperature inside of the cavity 12, prevent heatdissipating from the combustion device 40 through the chamber 16, andthereby to keep the temperature of the infrared ray assembly 54 between900 and 1100° C. and reduce the gas consumption. The heat storage member22 would absorb part of the heat from the top of the front section 122of the cavity 12, which makes the temperature at the top of the frontsection 122 be lower than the temperature at the top of the middlesection 126 so as to drive the hot air to flow downwardly, and theflowing back of the hot air could be increased, and the heating effectwould be improved. Moreoever, it is also favorable to keep thetemperature of the infrared ray generation assembly 54 between 900 and1100° C. and reduce the gas consumption.

With the heating method as described above, the food ingredients in thechamber could be heated sufficiently, and the gas consumption could bereduced as well.

Furthermore, a retained air flow could be generated in the gap a1 andthe gap a2, which are respectively formed between the first part 502 ofthe supporting plate 50 and the inner wall surface 124 a at the rearsection 124 of the cavity 12, and between the second part 504 of thesupporting plate 50 and the top wall surface at the rear section 124 ofthe cavity 12, to pull the hot air flow, which flows back, to moveupwardly again, and thereby to make a circulation effect of the hot airflow in the cavity 12 become better.

In addition, redundant hot air flow would be exhausted from the outlet164 a to the outside through the air guide structure 18 and the exhaustpipe 20. During the exhaust process, cold air would be drawn in from theoutside via the feeding opening 362 a of the front plate 362 and theentry 14, and then be pulled up to the air guide structure 18 and theexhaust pipe 20 through the air outlet 164 a so as to lower atemperature of the front plate 362 and a temperature of the exhaust pipe20, thereby avoiding the user to be burned by the front plate 362 andthe exhaust pipe 20. Since the heat storage member 22 contacts the airguide structure 18, part of the heat of the heat storage member 22 wouldbe transferred to the air guide structure 18 to heat the exhaust channelE, which results in rising of steam as an upward pulling force to speedup an exhaust rate of the hot air flow, and thereby to increase theexhaust efficiency and improve the circulation effect of the hot airflow in the cavity. The guide plate 182 which tilts upwardly is alsofavorable to increase air guide performance such that the exhaustefficiency could be further improved. Meanwhile, the increase in theexhaust rate of the hot air flow also would increase the speed of coldair drawing into the air guide structure 18, which could make thetemperature of the front plate 362 and the exhaust pipe 20 become lower.The exhaust pipe 20 is located at the top of the front section 122 ofthe cavity 12, which could make the exhaust path be shorter, whereby theair flow could be exhausted out faster.

A combustion device 60 of a second embodiment according to the presentinvention is illustrated in FIG. 11 and FIG. 12. The combustion device60 of the second embodiment includes a basic structure similar to thecombustion device 40 of the first embodiment, and further includes asteam generation assembly 62, which is adapted to generate steam to beused as an over-heated steam for combustion. The steam generationassembly 62 includes a steam source which is a water tank 64 as anexample, a first pipe 66, and a second pipe 68. Wherein, the water tank64 is disposed at one side of the burners 42. In more details, the watertank 64 is mounted on the first part 502 of the supporting plate 50, andis located between the first part 502 and the burners 42. The water tank64 includes a water inlet 642 for filling water. The first pipe 66 isconnected to a top of the water tank 64, and two terminals of the firstpipe 66 communicate with an interior of the water tank 64. A section 662of the first pipe 66 includes a plurality of spraying holes 662 a. Inpractice, there could be only one spraying hole 662 a, and the section662 is located between the flame outlet 422 of the burners 42 and thereflection surface 542 a of the infrared ray generation assembly 54. Twoterminals of the second pipe 68 are respectively connected to two sidesof the water tank 64 and communicate with the interior of the water tank64. The second pipe 68 surrounds the burners 42, and a section 682 ofthe second pipe 68 is located below the exterior surface of the coverplate 48. The burners 42 are located between the section 682 of thesecond pipe 68 and the water tank 64. The section 682 includes aplurality of spraying holes 682 a which face toward the front section122 of the cavity 12. In practice, there could be only one spraying hole682 a.

After heating of the water contained in the water tank 64 of the steamgeneration assembly 62, the water becomes steam which would spray outfrom the spraying holes 662 a of the first pipe 66, wherein the steamcould be either guided to the infrared ray generation mesh 542 by thefirst pipe 66 to be used as the over-heated steam for forming thewater-gas, or be used as the over-heated steam for heating the foodingredients. The steam which sprays out from the spraying holes 682 a ofthe second pipe 68 is mainly used as the over-heated steam for heatingthe food ingredients, however, also could be used as the over-heatedsteam for forming the water-gas.

With the steam generated from the steam generation assembly 62 as thesource of the over-heated steam, the heating efficiency could beimproved efficiently. In practice, the steam generation assembly 62could only include the first pipe 66 or the second pipe 68. On the otherhand, the steam source also could be disposed outside of the cavity 12,and the first pipe 66 and the second pipe 68 could be directly connectedto the steam source.

As illustrated in FIG. 13 and FIG. 14, a kiln 300 of a third embodimentaccording to the present invention includes a structure which is similarto that of the first embodiment, wherein the kiln 300 of the thirdembodiment is different from that of the first embodiment in that in thecurrent embodiment, a first inclined plate 704, and a second inclinedplate 706 of a chamber 70 are respectively joined to a main body 702 ofthe chamber 70 with edges of the main body 702, the first inclined plate704, and the second inclined plate 706, which are to be joined, beingbent in advance, which forms a plurality of ridges 70 a. The ridges 70 acould reinforce the strength of the chamber 70 and avoid the heatstorage member 22 or the thermal insulation structure 24 from slidingdown effectively. For example, part of the heat storage member 22 whichis outside of the space S1 is surrounded by the plurality of ridges 70 aat the periphery of the first inclined plate 704, thereby avoiding theheat storage member 22 from sliding down from the first inclined plate704. Meanwhile, the ridges 70 a at other positions of the chamber 70could prevent the thermal insulation structure 24 from sliding down,which reinforces the joined strength of the chamber 70 and the thermalinsulation structure 24.

In the current embodiment, an exhaust pipe 72 includes an outer pipe 722and an inner pipe 724, wherein one end of the outer pipe 722 isconnected to the housing 36, and the outer pipe 722 is adapted tocommunicate the isolation space S2 inside of the housing 36 with anoutside of the cover 366; the inner pipe 724 penetrates through thethrough hole 366 c, and the inner pipe 366 is adapted to communicate theair guide structure 18 with the outside of the cover 18. Whereby, theredundant hot air in the isolation space S2 could be exhausted outthrough the outer pipe 722 so as to reduce heat dissipation from theisolation space S2 to the housing 36 and lower the temperature of thefront plate 362. The configuration of the outer pipe 722 and the innerpipe 724 of the exhaust pipe according to the current embodiment alsocould be utilized in the first embodiment.

In addition, a carrier plate 74 of the current embodiment is a discshape and is rotatably disposed on the bottom of the chamber 70. In moredetails, a driving motor 78 is further disposed on a stage 76. Thedriving motor 78 is connected to the carrier plate 74 via a rotationmember 80 to drive the carrier plate 74 to rotate. Whereby, the foodingredients disposed on the carrier plate 74 could be uniformly heated.The rotatable design of the carrier plate 74 of the current embodimentalso could be utilized in the first embodiment.

As illustrated in FIG. 15, a kiln 400 of a fourth embodiment accordingto the present invention includes a structure which is similar to thatof the first embodiment. The kiln 400 of the current embodiment isdifferent from that of the first embodiment in that the gas regulationvalve provided in the first embodiment is adapted for the user to adjustthe gas flow rate of the burners 42 manually, but a control system isprovided in the current embodiment to replace the manual adjustmentinstead. In the current embodiment, the control system of the kiln 400includes a thermometer 82, a flow rate regulation device 84, and acontrol device 86, wherein the flow rate regulation device 84 and thecontrol device 86 are disposed in the stage 30, which would be describedin detail as follows.

The thermometer 82 is disposed in the cavity 12 to detect thetemperature inside of the cavity 12. In the current embodiment, thethermometer 82 is located at the middle section 126 of the cavity 12.However, the thermometer 82 also could be disposed at the front section122 of the cavity 12.

The flow rate regulation device 84 communicates with at least one of theburners 42, and a flow rate regulation valve 844 is controlled to adjusta gas flow of the at least one burner 42. In the current embodiment, theflow rate regulation device 84 includes a channel valve 842 and a flowrate regulation valve 844, wherein one end of the channel valve 842 isconnected to the gas source; one end of the flow rate regulation valve844 is connected to the channel valve 842, and another end of the flowrate regulation valve 844 communicates with the burners 42. The channelvalve 842 could be controlled to close or open so as to shut or pass thegas. The flow rate regulation valve 844 could be controlled to regulatethe gas flow to be transported to the burners 42.

The control device 86 is electrically connected to the thermometer 82,and the channel valve 842 and the flow rate regulation valve 844 of theflow rate regulation device 84. The control device 86 is alsoelectrically connected to the ignition assembly 56, an input unit 88,and a display unit 90, wherein the input unit 88 is adapted for the userto input an ignition command, and a setting temperature; the displayunit 90 is adapted to display a message.

After inputting the ignition command via the input unit 88 by the user,the control device 86 would control the ignition assembly 56 to igniteand the channel valve 842 to open so as to ignite the gas of the burners42. Then, the control device would control the flow rate regulationvalve 844 of the flow rate regulation device 84 to adjust the outputtedgas flow based on the inputted setting temperature and the temperatureof the cavity which is detected by the thermometer 82, and thereby tomaintain the temperature inside of the cavity at a constant temperaturerange corresponding to the setting temperature. Whereby, an automatictemperature control could be realized.

In order to fulfill the object of infrared ray heating, the infrared raygeneration assembly 54 of the combustion device 40 would generateinfrared rays of a predetermined wavelength range which irradiate towardthe middle section 126 and the front section 122 of the cavity 12 whenthe gas flow output from the flow rate regulation device 84 is above apredetermined flow rate. The predetermined wavelength range is between 4and 9 μm. When the temperature detected by the thermometer 82 is betweenthe constant temperature range or higher than an upper limit of theconstant temperature range, the control device 86 would control the flowrate regulation valve 844 of the flow rate regulation device 84 to makethe gas flow output from the flow rate regulation valve 844 be equal toor higher than the predetermined flow rate. Whereby, in addition to keepthe cavity 12 at a constant temperature, the infrared ray generationassembly 54 also could generate infrared ray for heating foodingredients. If a maximum gas flow rate is determined as the gas flowoutput from the regulation device 84 when the regulation device 84 isbeing controlled, the predetermined flow rate is preferably equal to orhigher than one-third of the maximum gas flow rate.

In the current embodiment, the kiln 400 further includes an infrared raydetector 92, a flame sensor 94, and a carbon monoxide detector 96 whichare electrically connected to the control device 86 respectively.Wherein, the infrared ray detector 92 is disposed at the bottom of themiddle section 126 of the cavity 12, and adapted to detect the infraredray emitted by the combustion device 40. When the wavelength of theinfrared ray detected by infrared ray detector 92 is between thepredetermined wavelength range, the control device 86 would control thedisplay 90 to display a prompt message (e.g. a light signal or a textmessage) to remind the user that the infrared ray suitable forpenetrating food ingredients is already generated by the combustiondevice 40. Of course, the infrared ray detector 92 also could bedisposed at the front section 122 of the cavity 12.

The flame detector 94 is disposed at the top of the middle section 126of the cavity, and is higher than the infrared ray generation assembly54. When a flame is detected by the flame detector 94, the controldevice 86 would control the display unit 90 to display a prompt messageto remind the user that an open fire is already generated and could beused to heat the food ingredients.

The carbon monoxide detector 96 is disposed in the exhaust channel E,and adapted to detect a concentration of carbon monoxide in the air flowpassing through the exhaust channel E. When the concentration of thecarbon monoxide detected by the carbon monoxide detector 96 is higherthan a predetermined value, the control device 86 would control thechannel valve 842 of the flow rate regulation device 84 to shun the gas.Whereby, it is favorable to avoid the concentration of the carbonmonoxide contained in the exhausted gas from becoming too high to harmthe human body.

As illustrated in FIG. 16, a kiln 500 of a fifth embodiment according tothe present invention includes a structure which is similar to that ofthe fourth embodiment. Wherein, the kiln 500 of the fifth embodiment isdifferent from that of the fourth embodiment in that a flow rateregulation device 98 of the current embodiment includes a plurality ofgas switch valve 982, which are electrically connected to a controldevice 99. The plurality of gas switch valves 982 communicate with theburners 42 respectively, and could be controlled by the control device99 to close or open respectively, and thereby to adjust the gas flowoutput to the burners 42. When all of the gas switch valves are open, agas flow output to the burners 42 is a maximum gas flow rate; when onlyone of the gas switch valves 982 is turned on, the gas flow output fromthe flow rate regulation device 98 is the predetermined flow rate whichenables the combustion device 40 to generate the infrared ray of thepredetermined wavelength range. When the temperature detected by thethermometer 82 is between the constant temperature range or higher thanthe upper limit of the constant temperature range, the control device 99would control at least one of the gas switch valves 982 to open, wherebythe infrared ray generation assembly 54 could be maintained at thetemperature which enables the combustion device 40 to generate theinfrared ray of the predetermined wavelength range.

In the current embodiment, when the temperature detected by thethermometer 82 is between the constant temperature range or higher thanthe upper limit of the constant temperature range, the control device 99would control the gas switch valves 982 to be open by turns so as tomake the burners 42 generate flames sequentially. For example, if onlythe first gas switch valve 982 is turned on, the second gas switch valve982 would be turned on after a period of time and then the first gasswitch valve 982 would be turned off; the third gas switch valve 982would be turned on after another period of time, and the second gasswitch valve 982 would be turned off; thereafter, the first gas switchvalve 982 would be turned on again, and the third gas switch valve 982would be turned off. In this way, the burners 42 could generate flamesby turns to heat different portions of the infrared ray generationassembly 54, and thereby to avoid the flames from only applying on asingle position, which results in the infrared ray generation assembly54 to degrade and be damaged earlier. The control systems of the fourthand the fifth embodiments also could be utilized in the second and thethird embodiments.

As mentioned above, with the structural design of the combustion deviceand the stove, the kiln of the present invention is favorable toincrease the heating efficiency and shorten a cooking time of the foodingredients. In addition, the combustion device and the thermalinsulation structure of the present invention are not limited to beapplied to kilns, and could be utilized in other heating apparatus. Theaforementioned combustion devices are not limitations to the kilns ofthe first, the second, and the third embodiments, however, the kilnsalso could include firewood, fire rows disposed in the cavity, or anelectrothermic heat source, and preferably the kilns could include aheat source which is capable of generating infrared ray.

It must be pointed out that the embodiments described above are onlysome embodiments of the present invention. All equivalent structureswhich employ the concepts disclosed in this specification and theappended claims should fall within the scope of the present invention.

What is claimed is:
 1. A kiln, comprising: a stove, including a cavity,an entry, and an air outlet, wherein the cavity includes a front sectionand a rear section; the front section communicates with the entry, whilethe rear section is away from the entry; a top wall surface of the frontsection tilts downwardly toward the entry; the air outlet is locatedbetween a top of the front section and the entry; a combustion device,disposed in the rear section of the cavity and including at least oneburner, a supporting assembly, and an infrared ray generation assembly,wherein the at least one burner includes a flame outlet; flames aregenerated from the flame outlet by burning gas via the at least oneburner; the supporting assembly includes a cover plate which is disposedabove the at least one burner and includes at least one hollow portion;the infrared ray generation assembly is mounted to the supportingassembly and is located above the cover plate; the infrared raygeneration assembly is heated by the flames generated by the at leastone burner to generate infrared ray; the infrared ray generationassembly includes an emission surface which is corresponding to the atleast one hollow portion and adapted to emit the infrared ray; and anexhaust pipe, communicating with the air outlet.
 2. The kiln of claim 1,wherein the cover plate is protruded outwardly toward a direction awayfrom the infrared ray generation assembly; the cover plate includes aplurality of the hollow portions, including a plurality of holes and anopening, wherein the flames generated from the flame outlet pass throughthe opening and apply on the infrared ray generation assembly, and theemission surface is corresponding to the plurality of holes.
 3. The kilnof claim 1, wherein the supporting assembly includes another cover platewhich is joined to the cover plate, and the two cover plates jointlyform a containing space therebetween; the infrared ray generationassembly is disposed in the containing space.
 4. The kiln of claim 3,wherein said another cover plate includes a plurality of holes.
 5. Thekiln of claim 3, wherein the supporting assembly includes a supportingplate having a first part and a second part disposed above the firstpart; the at least one burner is mounted on the first part, and theanother cover plate is mounted on the second part; the rear section ofthe stove includes an inner wall surface which faces the entry, and atop wall surface of the rear section tilts upwardly toward a directionaway from the inner wall surface; the first part and the inner wallsurface are spaced apart with a gap; the second part and the top wallsurface of the rear section are spaced apart with another gap.
 6. Thekiln of claim 1, wherein the infrared ray generation assembly includesan infrared ray generation mesh, and a surface of the infrared raygeneration mesh is the emission surface.
 7. The kiln of claim 6, whereinthe infrared ray generation assembly includes a reflection plate havinga reflection surface; the infrared ray generation mesh includes anotheremission surface which is opposite to the reflection surface, while theemission surface of the infrared ray generation mesh faces thereflection surface; the reflection surface is concaved toward adirection away from the infrared ray generation mesh.
 8. The kiln ofclaim 1, wherein the combustion device comprises a steam generationassembly having a pipe; a section of the pipe includes at least onespraying hole; the section of the pipe is located between the flameoutlet of the at least one burner and the emission surface of theinfrared ray generation assembly.
 9. The kiln of claim 1, wherein thecombustion device further comprises a steam generation assembly having apipe; a section of the pipe includes at least one spraying hole; thesection of the pipe is located below an outer surface of the coverplate, and the at least one spraying hole faces toward the front sectionof the cavity.
 10. The kiln of claim 1, wherein the stove comprises achamber, an air guide structure, and a heat storage member; an interiorof the chamber forms the cavity, and the chamber further includes theentry and the air outlet; the air guide structure includes a guide plateand is disposed at the top of the front section of the cavity, whereinthe air guide structure communicates with the air outlet; the exhaustpipe is located above the guide plate; the heat storage member covers anexterior of the cavity at the top of the front section of the cavity andcontacts the guide plate.
 11. The kiln of claim 10, wherein the airguide structure comprises a lid plate which is joined to the chamber andthe guide plate; a space is enclosed by the lid plate, the guide plateand the chamber; at least one portion of the heat storage member isdisposed in the space.
 12. The kiln of claim 1, further comprising ahousing disposed on an exterior of the stove and an isolation space isformed between the housing and the exterior of the stove.
 13. The kilnof claim 1, wherein the stove comprises a chamber and a thermalinsulation structure which covers an exterior of the chamber; thechamber includes the cavity and the entry; the thermal insulationstructure includes a heat conduction layer, a heat storage layer, and areflection layer; the heat conduction layer is disposed on the exteriorof the chamber; the heat storage layer is disposed on an exterior of theheat conduction layer and contacts the heat conduction layer; the heatconduction layer is adapted to conduct heat from the chamber to the heatstorage layer; the reflection layer is disposed on an exterior of theheat storage layer and includes a heat reflection layer which faces theheat conduction layer; a thermal conductivity of the heat conductionlayer is greater than that of the heat storage layer.
 14. The kiln ofclaim 13, wherein the thermal insulation structure includes anotherreflection layer and a thermal insulation layer; the thermal insulationlayer is disposed between the reflection layer and said anotherreflection layer; a thermal conductivity of the thermal insulation layeris equal to or smaller than that of the heat storage layer.
 15. The kilnof claim 1, further comprising a door, wherein the door includes a mainplate and a shield; the main plate includes a plurality of vents and isdetachably joined to the stove at the entry; the shield is movablydisposed on the main plate and adapted to close the vents.
 16. The kilnof claim 1, further comprising a door, wherein the door includes a mainplate and a blocking plate; the main plate is detachably joined to thestove at the entry; the blocking plate is adapted to close the airoutlet.
 17. A heating method for the kiln of claim 1, comprising stepsof: controlling the at least one burner to generate flames and heatingthe infrared ray generation assembly with the heat to generate infraredray, wherein the flames generated by the at least one burner passthrough the cover plate and form an open fire on the top of the cavity;forming over-heated steam from the steam generated by burning gas andpassing the over-heated steam through coke which is formed on theinfrared ray generation assembly while burning the gas; and guiding hotair flow from the top wall surface of the front section of the cavitydownwardly to make to hot air flow back to the at least one burner, anddrawing air from the entry at the same time.
 18. The heating method ofclaim 17, wherein a temperature of the infrared ray generation assemblyis kept between 900 and 1100° C.
 19. The heating method of claim 17,wherein the flames generated by the at least one burner apply on thecover plate, which makes the cover plate generate infrared ray.
 20. Theheating method of claim 17, further comprising a step of providing asteam source, and guiding the steam generated by the steam source to theinfrared ray generation assembly so as to form the over-heated steam.